Transmitting and receiving for hertzian waves.



No. 726,413. PATENTED APR. 28, 1903.

E. DUGRETET.

TRANSMITTING AND RECEIVING APPARATUS FOR HERTZIAN WAVES. APPLICATIONFILED NOV. 1, 1901.

NOMD L.

. M m $5M! m: Norms Puma co, PHOTO-LITHO.. wasnmm'o'v u.

UNITED STATES" EUGENE DUORETET,

PATENT OFFICE.

OF PARIS, FRANCE.

TRANSMITTING AND RECEIVING APPARATUS FOR HERTZIAN WAVES.

SPECIFICATION forming part of Letters Patent No. 726,413, dated April28, 1903.

Application filed November 1, 1901. Serial No. 80,723. (No model.)

To (tZZ whom, it may concern:

Be it known that I, EUGENE Duonnrn'r, a citizen of the French Republic,and a resident of Paris, France, have invented certain new and usefulImprovements in Transmitting and Receiving Apparatus for I-Iertzian-Waves, of which the following is a specification.

In my various notes upon currents of great variations and high tensionof Tesla, Thomson, and Oudin I have shown after practical experimentsthat it was possible to use these currents for the transmission ofHertzian Waves through space, that they increased the carrying power,that applied to aerial radiators and collectors (antennae) some of thesedevices permitted the regulation or bringing into agreement of the postswith one another, and that it Was very necessary, as shown by Thomsonand Tesla in their notes, that the condensers of the discharge-circuit,the capacities, and self-induction circuits of the apparatus should beperfectly regulated with one another in order to obtain the greatesteffect.

The device invented by me herein illustrated is of variable shapes andsize and is applicable to the devices of Thomson and of Tesla. Itconstitutes an important improvement, the exclusive property of whichwill hereinafter be claimed.

In the accompanying drawings, Figure 1 shows an apparatus applied to aThomson or Tesla apparatus. Fig. 2 shows this apparatus applied to arelay-receiver.

The essence of my invention lies in a transformer for induction-currentsand especially adapted for use in connection with transmitting andreceiving devices for Hertzian waves, wherein it has been foundnecessary to exactly regulate the discharge and induction circuits inrelation to one another.

My transformer is adapted to enable the relations of thedischarge-circuits and the inducing-circuit to be changed at will and asthe needs demand. This device consists, essentially, of a solenoid, thenumber of whose efiective coils may be varied to give different effectsupon the introduction of a current thereto and so regulate the dischargewith relation to the inductive effects. The means for accomplishing thiswill be more fully described. Mounted uponthe solenoid S are graduatedinsulated supports 1 2 3 4:. These supports carry sliding contact-piecesR, R, R, and R, which may be placed in any position with relation to thecoils of the solenoid that may be desired. In this manner the number ofspirals of the solenoid acted upon by the inducing current, and hencethe inductive effects, maybe varied at will. The solenoid may be thusregulated as to either self-inductionor as to inducing action, or thelength between a a may be varied for these purposes by the addition ofconductors or bridges and suppressing at will the effect of any numberof the spirals of the solenoid S. As may be desired these ends a, a maybe either connected to suitable sliding contacts of these currents ormay be left free.

This apparatus permits numberless combinations which can be realizedwith three sliding contacts; but the four, Figs. 1, 2, give moreelasticity to the adjustments. wound wire S (solenoid) for largesections may be made of several wires, as in the solenoid of La Rivescondenser. The insulated supports 1 2 3 4 are graduated. They bringthecurrent to their respective sliding contacts.

This apparatus is reversible by means of suitable spring slidingcontacts R. The number of spirals comprised at :r can be smaller orgreater than these comprised at 2/ and vice versa. A self inductioncompensator by anadjustable condenser (liquid ones serve in all cases)may be added at a: and y, according to the uses to which this apparatusis applied.

Fig. 1 shows, by way of example, this apparatus applied to one ofThomsons or of Teslas devices, with a condenser 0, giving an oscillatingdischarge at O. The tensioncurrent is brought in at i if. The condenser0, with any number of jars, is of my invention, the capacity thereofbeing regulated according to the desired effect. For wireless telegraphythe collector (antenna) is at O and the connection to earth at 0.

Fig. 2 shows this apparatus applied to a relay-receiver withradioconductor B It is also applicable to the Popoff-Ducretet radio-Thetelephonic receiver without relay. In this application the wire ofthe solenoid S is much finer than that in Fig. 1.

In both cases, Figs. 1 and 2, C represents the collector (antenna)either simple, multiple, or tubular. Its adjusting means are not shown.It is likewise with the connection to earth C Figs. 1 and 2. It can bemade with or without a suitable capacity condenser.

Having fully described my invention, what I claim, and desire to secureby Letters Patent, is-

A device of the character described, comprising a solenoid forregulating the relation

